act up

• • [口语]
  • (汽车、机器)运转不正常；失灵；出毛病：

    The car's engine is beginning to act up.

    汽车发动机在开始失灵。

  • (身体某部分)疼痛起来，作痛，(疾病)发作：

    His stomach acted up after dinner.

    饭后他的胃病发作了。

  • 举止不端；捣蛋，调皮；任性，使性子，耍脾气，发怒：

    The children have been acting up all evening.

    整个晚上孩子们都在调皮捣蛋。

  • 做出适当的反应，适当地做出反应：

    When the girls tease him,he doesn't quite know how to act up.

    姑娘们拿他逗乐时，他就没辙了。

  • 炫耀，表现：

    The kid likes to act up for the benefit of anyone who cares to notice.

    这孩子喜欢做各种动作来惹人注意。